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  Services » Publications » Technical reports - by year » TR200423

Mangatutu river and catchment management plan

 

Report: TR 2004/23
Author: Michael Duffy

Abstract

Waikato Regional Council has established a comprehensive Waikato River catchment based funding policy to address soil conservation, river management and flood protection issues across the entire Waikato catchment area.

Consultation with landowners has identified issues in specific catchments, which require attention. The Mangatutu River Management Group was formed as a result of this consultation and its main aim is to address river management issues in the Mangatutu River.

Riverbank erosion and gravel management are the main issues in the catchment that have been raised by the River Management Group. Waikato Regional Council will focus on the river works and address those soil conservation works on individual properties on a case by case basis.

The Mangatutu River has historically been excavated by individual landowners. Through this process the river has degraded in places, while in other places along the river it is shallow and has severe bank erosion.

An integrated river and catchment management plan is considered the appropriate way to provide consistent information and advice to deal with stabilising the river through erosion control works, gravel placement and riparian plantings.

Mangatutu River and Catchment Management Plan
(303 kb, 43 seconds to download, 56k modem)  

Table of Contents

1 Introduction 1
2 River & Catchment Description 1
2.1 Location 1
2.2 Vegetation 1
2.3 Rainfall 1
2.4 Geology and Soils 1
2.5 Erosion 2
3 Issues Identified by Landowners/Care Group 2
3.1 Erosion 2
3.1.1 Hill Slope Erosion 2
3.1.2 Streambank Erosion 2
3.2 River Management 2
3.2.1 Gravel Issues 2
3.2.2 Obstructions 3
3.2.3 In-stream Works/Structures 3
3.2.4 Bank Erosion 3
3.2.5 Natural Diversions 3
3.3 Flooding 3
3.3.1 Localised Flooding 3
4 Related Issues 3
4.1 Water Quality 3
4.2 Recreational Fisheries 4
4.3 Biodiversity 4
4.4 Biosecurity 4
5 Management Strategy 5
5.1 Introduction 5
5.2 Interested Parties 5
5.2.1 Landowners 5
5.2.2 Fish & Game, New Zealand 6
5.2.3 Department of Conservation (DoC) 6
5.2.4 Iwi 6
5.2.5 Otorohanga District Council 7
5.3 Environmental Monitoring 7
5.3.1 Introduction 7
5.3.2 Monitoring Objectives 7
5.3.3 Recommendations for Monitoring 7
5.3.4 Riparian Characteristic Survey 8
5.3.5 Photo Points 8
5.3.6 Permanent Suspended Sediment Site 9
5.3.7 Suspended Sediment Snapshots 9
5.3.8 Water Temperature & Stream Ecological Health 9
5.3.9 Scheduled Monitoring 9
5.3.10 Estimated Costs 10
6 Funding Mechanism 10
6.1 Cost of Works 11
7 Implementation 11
7.1 Soil Conservation 11
7.1.1 Soil Conservation Measures 11
7.1.2 Farm Planning and Funding 11
7.2 River Management 11
7.3 Flooding 11
8 Local Management Plan 11
8.1 Types of Activities 11
8.1.1 Issues 11
8.1.2 River Control Treatment Methods 12
8.1.3 Gravel Removal 12
8.1.4 Vegetation Control 12
8.1.5 Willow Replacement and Bank Stabilisation 12
8.1.6 Rock Groynes 12
8.1.7 Willow Maintenance 12
8.1.8 Stock Access and Water Quality 12
8.1.9 Environmental Monitoring 12
8.1.10 Clean Streams Project 13
9 Resource Consent Requirements 13
Appendix 1 Property by property issues in Mangatutu Catchment 15
Appendix 2 Mangatutu River and Catchment Funding Strategy - 10 years 17
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